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...n Reg or a super-register of Reg is defined, not any overlapping Reg is defined. The code looks like this: bool IsRegOrSuperReg = MOReg == Reg || TRI->isSuperRegister(MOReg, Reg); ... if (IsRegOrSuperReg) { PRI.Defines = true; // Reg or a super-register is defined. if (!MO.isDead()) AllDefsDead = false; } I think the fundamental bug here is that the operands are swapped when passed into isSuperRegister. The definition of isSuperRegister is /// \brief Returns true if RegB is a super-register of RegA. bool isSuperRegister(unsigned RegA, unsigned RegB) const; so, it looks to me as if in...

...n Reg or a super-register of Reg is defined, not any overlapping Reg is defined. The code looks like this: bool IsRegOrSuperReg = MOReg == Reg || TRI->isSuperRegister(MOReg, Reg); ... if (IsRegOrSuperReg) { PRI.Defines = true; // Reg or a super-register is defined. if (!MO.isDead()) AllDefsDead = false; } I think the fundamental bug here is that the operands are swapped when passed into isSuperRegister. The definition of isSuperRegister is /// \brief Returns true if RegB is a super-register of RegA. bool isSuperRegister(unsigned RegA, unsigned RegB) const; so, it looks to me as if in...

> On Dec 3, 2015, at 5:36 PM, Quentin Colombet via llvm-dev <llvm-dev at lists.llvm.org> wrote: > >> >> On Dec 3, 2015, at 5:11 PM, Smith, Kevin B <kevin.b.smith at intel.com <mailto:kevin.b.smith at intel.com>> wrote: >> >> >> >>> -----Original Message----- >>> From: Quentin Colombet [mailto:qcolombet at apple.com